Lift off was good...went faster and higher than anticipated.  separation shortly after apogee and was fairly robust...shot the nose cone off to the side about 100ft from the lower section.  Almost caught the lower, but just missed and it fell on hard-pack snow and broke off a fin.  Upper section was fine ("snow darted" in).  Seems the fin attachment area is too small for the lower section considering it will be landing with the weight of the engine.